Revolution indicator and a program for the revolution indicator
Inactive Publication Date: 2008-05-08
ONO SOKKI CO LTD
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Summary
Abstract
Description
Claims
Application Information
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[0015]This invention is intended to provide a revolution indicator and a program for the revolution indicator, which can detect a varying number of revolutions precisely with superior response.
[0019]According to the present invention, the revolution indicator computes continuously the first analytical data under the first data length and determines whether there is a variation or not in the computed first analytical data, respectively, and when there is a variation in the number of revolutions is computed based on the first analytical data, respectively, and when there is no variation, the second analytical data is computed under the second data length which is longer than the first data length, and since the number of revolutions is computed based thereon, for the data in which there is a variation in the number of revolutions of the measuring object, the number of revolutions responding to the variation can be computed with superior response, and for the data in which there is no variation, the number of revolutions is computed with improved measuring accuracy based on greater detail in the frequency resolution.
Problems solved by technology
However, since such a revolution indicator must be directly mounted to the measuring object, there have been problems; in which a jig must sometimes be fabricated for mounting the revolution indicator, and the effect(s) of the mounted revolution indicator end up changing the revolving movement properties of the measuring object, thus making it sometimes impossible to measure precisely the number of revolutions of the measuring object.
However, since revolution indicators such as these compute analytical data by FFT at a specific number of sampling points, one problem has been that the response of the analytical data to the variation of the number of revolutions is low, causing the lowering of the reliability of the analytical data.
However, the resolution of the frequency becomes coarse, which sometimes lowers the reliability of the computed analytical data.
However, due to the lowering of the frequency resolution, the accuracy of the analytical data becomes coarse.
However, since the data length of the data is lengthened, it is hard to respond to variations in the number of revolutions, which sometimes makes it difficult to determine the maximum value of the spectrum, and sometimes even lowers the measuring accuracy of the number of revolutions when varying.
Method used
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first embodiment
The First Embodiment
[0033]Preferred embodiment(s) of the present invention shall be explained below with reference to the drawings. Moreover, in each drawing, the same constituents shall be designated by the same reference numerals, and when appropriate explanations thereof shall be omitted.
[0034]The revolution indicator 10 is a measuring instrument computing the number of revolutions (revolution speed) of a revolving motor 30 based on the vibration data (data) detected by the vibration pickup 20, having an input portion 11, a computation control portion 12, an indicating portion 13, an input amplifier portion 14, and a filter portion 15.
[0035]The input portion 11 is an A / D converter which inputs successively time-series vibration data detected by the vibration pickup 20 to the computation control portion 12.
[0036]In this embodiment, the vibration data input analogously from the vibration pickup 20 is made discrete by the sampling time (time resolution) of 0.00078125 seconds (1 / (500...
second embodiment
The Second Embodiment
[0077]Additionally, in the description of the second embodiment, by giving the same reference numerals or unified reference numerals to portions performing the similar functions to the first embodiment, redundant descriptions and drawings are properly omitted.
[0078]The different between the revolution indicator 10-2 of the second embodiment to the revolution indicator 10 of the first embodiment is, as shown in FIG. 5, that a CPU 16 and a memory portion 17 is provided in place of the computation control portion 12.
[0079]The computation function of the computation control portion 12 of the first embodiment is installed in the memory portion 17 as a revolution indicator program, which is activated by the CPU 16.
[0080]Moreover, in the first embodiment, the vibration data at the 256 sampling points is fast-Fourier-transformed to compute the vibration spectrum. However, in the second embodiment, the vibration data clipped at the 1024 sampling points is processed by th...
modified embodiment
[0088]Various modifications or changes are possible without being limited to the above described embodiments, and those inventions are within an equivalent range.
[0089](1) In each embodiment, as a means to detect the number of revolutions, the vibration data measured by the vibration pickup 20 is used. However, other methods may be used.
[0090]For example, the use of data measured from light, magnetism, sound, etc. are also possible.
[0091](2) In each embodiment, the revolution indicator 10 computes the vibration spectrum with the 256 sampling points and 1024 points. However, the number of sampling points may be set and the vibration spectrum may be computed in accordance to the measuring environments or measuring conditions thereof.
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Abstract
The object of the invention is providing a revolution indicator and a program for the indicator, which can detect a varying number of revolutions precisely. The indicator includes: a detecting portion detecting a physical phenomenon resulting from the revolution movement of a measuring object; a FFT computation portion performing a fast Fourier transform of the data detected by the detecting portion under a specific data length, and computing and outputting the analytical data; and a revolution computing portion computing the number of revolutions of the measuring object based on the analytical data output from the FFT computation portion. A variation determination portion is equipped, which makes the FFT computation portion compute the first analytical data continuously, based on the data successively detected by the detecting portion under the first data length and determines whether there is any variation or not in the first analytical data computed continuously.
Description
[0001]The disclosure of the following priority application is herein incorporated by reference: Japanese Patent Application No. 2006-302037, filed on Nov. 7, 2006.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a revolution indicator and a program for a revolution indicator which measures the number of revolutions of a measuring object performing a revolving movement.[0004]2. Related Art[0005]The number of revolutions (revolution speed) of a measuring object performing the revolving movement is measured by mounting such a revolution indicator as rotary encoder and the like.[0006]However, since such a revolution indicator must be directly mounted to the measuring object, there have been problems; in which a jig must sometimes be fabricated for mounting the revolution indicator, and the effect(s) of the mounted revolution indicator end up changing the revolving movement properties of the measuring object, thus making it sometimes imposs...
Claims
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Application Information
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